Re: gcc-2.95.3 vs gcc-3.0.4

[Martin Dalecki <dalecki@evision-ventures.com>]

Andrew Morton wrote:
> Larry McVoy wrote:
> 
>>Try 2.72, it's almost twice as fast as 2.95 for builds.  For BK, at least,
>>we don't see any benefit from the slower compiler, the code runs the same
>>either way.
>>
>>
> 
> Amen.
> 
> I want 2.7.2.3 back, but it was the name:value struct initialiser
> bug which killed that off.  2.91.66 isn't much slower than 2.7.x,
> and it's what I use.
> 
> "almost twice as fast"?  That means that 2.7.2 vs 3.x is getting
> up to a 3x difference.  Does anyone know why?

Yes. Basically the reason is a missconception what the compiler
should try to optimize in GCC.

> 
> [ Of course, if you can wink-in the object file from someone else,
>   it's not a problem.  (tum, tee tum...) ]
> 
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